13781222 has 16 divisors (see below), whose sum is σ = 25442592. Its totient is φ = 5451840.

The previous prime is 13781221. The next prime is 13781227. The reversal of 13781222 is 22218731.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a junction number, because it is equal to n+sod(n) for n = 13781191 and 13781200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13781221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37679 + ... + 38042.

It is an arithmetic number, because the mean of its divisors is an integer number (1590162).

Almost surely, 2^13781222 is an apocalyptic number.

13781222 is a deficient number, since it is larger than the sum of its proper divisors (11661370).

13781222 is a wasteful number, since it uses less digits than its factorization.

13781222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75743.

The product of its digits is 1344, while the sum is 26.

The square root of 13781222 is about 3712.3068299913. The cubic root of 13781222 is about 239.7521863360.

Adding to 13781222 its reverse (22218731), we get a palindrome (35999953).

The spelling of 13781222 in words is "thirteen million, seven hundred eighty-one thousand, two hundred twenty-two".